title: In vitro resistance of titanium and resorbable (poly L-co-DL lactic acid) osteosynthesis in mandibular body fracture.
abstract: This study was a comparative evaluation of the bending resistance of metallic and resorbable plates and screws in a mandibular body fracture model. Forty polyurethane synthetic hemimandibles were used; a vertical linear cut was made between the second and first premolars. These 40 hemimandibles were divided into four groups of 10 and were fixed with titanium plates and screws or resorbable plates and screws, with monocortical screws in the upper sector and bicortical screws in the lower sector. Bending resistance tests were done on a universal testing machine with a linear displacement speed of 1mm/min, a cell load of 500 N, and a load cell on the lower central incisor or on the lower second premolar. Results were analyzed using the Student's t-test, with the significance level set at 5%. No statistically significant differences were observed between the groups studied, either in the analysis of the osteosynthesis materials or related to the load-bearing points. The variables of displacement and peak load did not present any significant differences. In this in vitro model of a mandibular body fracture, the mechanical behaviour of a resorbable osteosynthesis was similar to that of a titanium osteosynthesis.
authors.affiliation: Division of Oral and Maxillofacial Surgery, Dental School, Universidad San Martin de Porres, Peru.
authors.forename: J
authors.initials: J
authors.lastname: Rodríguez-Chessa
authors.affiliation: Division of Oral and Maxillofacial Surgery, Dental School, Universidad de La Frontera, Chile; Center for Biomedical Research, Universidad Autónoma de Chile, Chile. Electronic address: sergio.olate@ufrontera.cl.
authors.forename: S
authors.initials: S
authors.lastname: Olate
authors.affiliation: Division of Oral and Maxillofacial Surgery, Dental School, Federal University of Juiz de Fora, Brazil.
authors.forename: H D
authors.initials: HD
authors.lastname: Netto
authors.affiliation: Division of Oral and Maxillofacial Surgery, Dental School, Federal University of Juiz de Fora, Brazil.
authors.forename: C
authors.initials: C
authors.lastname: Noia
authors.affiliation: Division of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas, Brazil.
authors.forename: M
authors.initials: M
authors.lastname: de Moraes
authors.affiliation: Division of Oral and Maxillofacial Surgery, Piracicaba Dental School, State University of Campinas, Brazil.
authors.forename: R
authors.initials: R
authors.lastname: Mazzonetto
mesh_terms: D020341:Absorbable Implants; D001860:Bone Plates; D001863:Bone Screws; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D006801:Humans; D066298:In Vitro Techniques; D019344:Lactic Acid; D008337:Mandibular Fractures / Q000601:surgery*; D008422:Materials Testing; D008953:Models, Anatomic; D016348:Osseointegration; D011091:Polyesters; D011108:Polymers; D013314:Stress, Mechanical; D014025:Titanium
chemical_list: D011091:Polyesters; D011108:Polymers; D019344:Lactic Acid; C033616:poly(lactide); D014025:Titanium
keywords: mandible fracture; osteosynthesis; resorbable material; titanium